Ments



(No Model.)

.S. NAGHTIGAL. MACHINE FOR BACKING PEARL BUTTONS.

Patented June 18, 1895.

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UVVEWTOiB Jaw M WITNESSES UNITED STATES PATENT OFFICE.

STEPHAN NACHTIGAL, OF DETROIT, MICHIGAN, ASSIGNOR, BY MESNE ASSIGN-MENTS, TO THE EXCELSIOR BUTTON COMPANY, OF SAME PLACE.

MACHINE FOR BACKING PEARL BUTTONS.

SPECIFICATION forming part of Letters Patent No. 541,382, dated J une18, 1895.

Application filed January 21, 1395- Serial No. 535,623- (No model.)

To all whom it may concern:

Be it known that I, STEPHAN NACHTIGAL, a citizen of Germany, residing atDetroit, county of W'ayne, State of Michigan, haveinvented a certain newand useful Improvement in Machines for Backing Pearl Buttons; andIdeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itpertains to make and use the same, reference be.- ing had to theaccompanying drawings, which form a part of this specification.

This machine relates to pearl button lathes, and has for its object animproved form of lathe for dressing the backs of pearl buttons and otherbuttons, or articles of a similar character.

The complete lathe consists of two parts, one of which holds the button,and the other of which holds the tool employed to dress the button.

The tool shown in this case consists of a grinding wheel, for which'maybe substituted any suitable cutting device.

In the drawings, Figure 1 shows in perspective the complete machine.Fig. 2shows in sectional elevation that part of the machine in which thecutting-wheelis held and by which it is rotated.

This machine is intended to produce on the back of the button a shapewhich is the result of grinding it by a cutting tool or an abradingtool, which rotates and wabbles, thus producing a composite motion,which forms on the back of the button an oval shape, depending somewhaton the relative size of the button and the abrading tool.

At the right hand of the drawings is shown the chuck, which I do notdesire to describe in this application further than to say that it isadapted to grasp the button by its edges and hold it against the face ofthe stone.

At the left end of the drawings is shown the device by which theabrading stone A is held and actuated.

B B B" indicate the main frame or bed piece, from which rise bearings 17b c 0. These bearings are in pairs. In the bearings l) b is journaled ahollow wheel D. Within that end which lies toward the bearing 0 is aninternal gear d. Between, the bearings b b,

upon the rim of the hollow Wheel D, provision is made for a driving beltby which the wheel D is driven from any convenient source of power.Beyond that end of the wheelD which is farthest from the bearings c, isa ball socket, f, at a point concentric to the wheel D; and within theball socketf' is journaled the ball f on the shank F, to the head ofwhich is secured in any suitable way the abrading wheel A.

As shown in the drawings, the abrading wheel A is made in the form ofthe frustum of a cone, and is held to the face F of the head of theshank F by a hollow cone that engages with suitable screw threads withthe head F. At the extreme opposite end of the shank F'is a sphericalhead or ball G, joined to the shank F by a neck g. The bearing posts 0and 0' support an arbor E, and on that end bf the arbor E which liestoward the bearing post I), is a crank wheel e, provided with a sockete, in which rests the ball Gon the end of theshank F. A suitable drivingpulley E is secured to the arbor E between the bearing posts a and c'.The arbor E is axially in line with the axis of the wheel; D, and thecenterof the bearing f is in the same axial line.

On the shaft F is a pinion d that engages within the internal gear cl.The rotation of the shaft E and the crank wheel 8 causes the abradingwheel A to both rotate and wabble. It will readilybe seen that, if thecrank wheel 6 were to be driven and the wheel D nlade stationary, therotation of the abrading wheel A would be several times faster than itswabble, and, in order to obtain the required wabbling speed, it wouldnecessitate a rotating, speed that would be destructive to the drivinggears. To obviate this, I have provided means for regulating-the speed,consistingin the means for driving the wheelD, and the gear d, as abovereferred to. It will also be apparent that the relative speed of therotation of the abrading wheel A and its wabbling motion may be variedat will by changing the speed of the wheel E or the wheel D. Thefinished out on the work will depend somewhat on its size, inasmuch as alarger button cannot be thrust as far into the angle formed by the pathof the face of the abrad- IOO ing wheel, as can be thrust a smallerbutton,

as the smaller button would be finished far-' ther over the edges than alarger one would; and, conversely, by changing the size of the abradingwheel A, removing one of one size, and placing one of another size uponit, which can readily be provided for, will enable the user to producealmost any shape in the backing otf of buttons that may be desired.

What I desire to claim is-- 1. In a lathe for treating buttons, thecombination of means for holding the buttons, an annular wheel and atraveling pinion, an abrading tool on the shaft of said pinion, meansfor operating said annular wheel, and means for producing travel of thepinion whereby said abrading tool is given both a rotating and awabbling motion, substantially as and for the purpose described.

2. In a machine for treating buttons, in combination with means forholding a button,

mounted on one end of a single shaft, means i engaging the opposite endof said shaft adapted to give said tool a wabbling motion, a pin ionmounted on said shaft, an internal gear adapted to engage with saidpinion whereby said tool is made to rotate, and means forgivin g saidinternal gear arotary motion whereby the relative speed of rotation andwabbling of said tool may be regulated, substantially as and for thepurpose described.

3. In a machine for treating buttons, the combination of means forholding the button, an abrading device rotatively held on a ball andsocket joint, a stem connecting such abrading device, connectedeccentrically to a rotating wheel, a hollow rotating wheel surroundingthe stem, and means fordriving the stem byamotion independent of thatderived from its eccentric connection with the first mentioned wheel,substantially as described.

In testimony whereof I sign this specification in the presence of twowitnesses.

STEPHAN NACHTIGAL. Witnesses:

CHARLES F. BURTON, HERMAN PRESSLER.

